[clang] [clang][WebAssembly] Handle casted function pointers with different number of arguments (PR #153168)

[Derek Schuff via cfe-commits]

dschuff wrote:

(BTW I'm going to be out for the next week, and then at the Wasm CG meeting the following week, so I probably won't get back to this until after that. I will get back to it though, despite my pushback here, I still want to come up with something here that works.).

https://github.com/llvm/llvm-project/pull/153168